Two FBI agents visited Jolie at her home in last Tuesday. They were there for three hours while seeking evidence that might warrant a formal investigation into the allegations surrounding Pitt.

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File photo of Brad Pitt posing with his children (from left) Pax Jolie-Pitt, Shiloh Jolie-Pitt, and Maddox Jolie-Pitt and his parents Jane Etta Pitt and William Alvin Pitt at the premiere of "Unbroken" held at The Dolby Theater in Hollywood. (Photo by Frank Trapper/Corbis via Getty Images)

The Los Angeles County Department of Children and Family Services has extended its investigation into allegations that Brad Pitt was involved in an alleged incident with a child aboard a private plane flying from Europe to L.A. on Sept. 15, E! News confirms.

The extension is due to new "key accusations." A separate source, however, insists that "the information about all sorts of other problems is not accurate."

The FBI, who visited Angelina Jolie's residence in Malibu last week for several hours — has conducted interviews with all potential witnesses, including some of their children. They've also interviewed other witnesses, including the flight crew aboard the plane during the alleged incident that was originally reported to the DCFS.

E! News learned there have been reports of "unintentional contact" between Pitt and a child.

The investigation may continue with more witness interviews, but E! News has been told they're expecting to conclude it shortly. Once they finish the investigation, if they decide there is probable cause of child abuse, they will write up reports and pass those along to the U.S. District Attorney, who will then look at the evidence and decide whether to prosecute.

No matter the outcome, the DCFS' decision will not affect Pitt and Jolie's divorce or their custody agreement over their six children — Maddox Jolie-Pitt, 15, Pax Jolie-Pitt, 12, Zahara Jolie-Pitt, 11, Shiloh Jolie-Pitt, 10, and twins Knox Jolie-Pitt and Vivienne Jolie-Pitt, 8 — which will have to be decided in family court.

The teen was reportedly part of the alleged altercation that occurred on the plane, but after not seeing his father for a month, they came face-to-face last week for the first time while meeting with a therapist present.

As part of a temporary custody agreement Pitt and Jolie reached in September, the actress was given sole custody of their children, and Pitt received visitation rights. At the time, we were told Jolie, 41, did not intend for the custody situation to remain permanent as she believes the former couple will need to co-parent in the future for the sake of their children.

An insider previously revealed Pitt was also eager "to see the kids and to work out an arrangement that is best for them" and "wants to work things out privately and amicably."

Meanwhile, two FBI agents visited Jolie at her home in last Tuesday. They were there for three hours while seeking evidence that might warrant a formal investigation into the allegations surrounding Pitt.

In a statement to E! News, a spokesperson for the FBI confirmed the investigation is continuing. "In response to your inquiry regarding allegations within the special aircraft jurisdiction of the United States; specifically, an aircraft carrying Mr. Brad Pitt and his children, the FBI is continuing to gather facts and will evaluate whether an investigation at the federal level will be pursued."